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fix(quickstart): resolve host-qualified tool names in callServerTool #807

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fix(quickstart): resolve host-qualified tool names in callServerTool #807

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19 changes: 18 additions & 1 deletion docs/quickstart.md
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Original file line number Diff line number Diff line change
Expand Up @@ -404,10 +404,27 @@ app.ontoolresult = (result) => {
serverTimeEl.textContent = time ?? "[ERROR]";
};

// Recover whatever prefix a multi-server host applied to this app's entry
// tool (e.g. "pdf-server-get-time" behind an aggregator) and reapply it to
// any tool this app calls back into, so callServerTool keeps working once
// the app is no longer connected 1:1 to a single server.
function resolveToolName(baseName: string): string {
const invokedName = app.getHostContext()?.toolInfo?.tool.name;
if (!invokedName) return baseName;
const entryTools = ["get-time"];
const ownToolName = entryTools.find((t) => invokedName.endsWith(t));
if (!ownToolName) return baseName;
const prefix = invokedName.slice(0, invokedName.length - ownToolName.length);
return prefix + baseName;
}

// Wire up button click
getTimeBtn.addEventListener("click", async () => {
// `app.callServerTool()` lets the UI request fresh data from the server
const result = await app.callServerTool({ name: "get-time", arguments: {} });
const result = await app.callServerTool({
name: resolveToolName("get-time"),
arguments: {},
});
const time = result.content?.find((c) => c.type === "text")?.text;
serverTimeEl.textContent = time ?? "[ERROR]";
});
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19 changes: 18 additions & 1 deletion examples/quickstart/src/mcp-app.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,10 +14,27 @@ app.ontoolresult = (result) => {
serverTimeEl.textContent = time ?? "[ERROR]";
};

// Recover whatever prefix a multi-server host applied to this app's entry
// tool (e.g. "pdf-server-get-time" behind an aggregator) and reapply it to
// any tool this app calls back into, so callServerTool keeps working once
// the app is no longer connected 1:1 to a single server.
function resolveToolName(baseName: string): string {
const invokedName = app.getHostContext()?.toolInfo?.tool.name;
if (!invokedName) return baseName;
const entryTools = ["get-time"];
const ownToolName = entryTools.find((t) => invokedName.endsWith(t));
if (!ownToolName) return baseName;
const prefix = invokedName.slice(0, invokedName.length - ownToolName.length);
return prefix + baseName;
}

// Wire up button click
getTimeBtn.addEventListener("click", async () => {
// `app.callServerTool()` lets the UI request fresh data from the server
const result = await app.callServerTool({ name: "get-time", arguments: {} });
const result = await app.callServerTool({
name: resolveToolName("get-time"),
arguments: {},
});
const time = result.content?.find((c) => c.type === "text")?.text;
serverTimeEl.textContent = time ?? "[ERROR]";
});
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